{% load abc %}
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

</head>
<body>

{% simple_add 1 2 %}
{{ "haha"|simple_add_fil:"hehe" }}

{% if "haha"|simple_add_fil:"hehe" %}
{% endif %}
</body>
</html>
